Rockbox is an open-source operating system for your MP3 player. It works on 1st, 2nd, 3rd, 4th, 5th generation iPods, and pretty much all of the popular non-Apple MP3 players.

-Rockbox gives you complete control over your product. If you don't like iTunes, you no longer have to use iTunes to upload music. If you don't want your battery life to be drained by a feature, simply get rid of it, or turn it off.
-With Rockbox, you can change your theme, visualizations, graphics, fonts, organization on the go! Create your own themes or find them online.
-There are no restrictions on file types. Any type of file the techies on the RockBox forum can figure out how to load into the software, you can use.
-Control your battery power more precisely. Set a sleep timer. Read entire books. The options are endless!